The faith of the people gives rise to Ajora. He preaches what they wish -- nay, need -- to hear. In doing so, they follow him. [It's a deceptively simple answer, but that's all he has to say on it for now. He looks at Vayne a second longer, considering what he wishes to ask next.]

How is it you know of Ultima's actions? Such secrets could cost you your life, if spoken in the wrong ears.